Computer Science – Sound
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.a21i..03a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #A21I-03
Computer Science
Sound
3344 Paleoclimatology (0473, 4900), 3362 Stratosphere/Troposphere Interactions, 3364 Synoptic-Scale Meteorology, 3389 Tides And Planetary Waves
Scientific paper
Equatorial waves forced by tropical convection affect cirrus cloud formation in the upper troposphere and drive global circulations in the middle atmosphere. We will present an analysis of equatorial waves in temperature measurements of the High Resolution Dynamics Limb Sounder (HIRDLS) instrument on the Aura satellite from 2005-2007. A rich variety of wave modes are revealed in the space-time Fourier spectral analysis of these data, including Kelvin waves, mixed-Rossby-gravity waves, equatorial Rossby waves, and equatorial inertia-gravity waves. Vertical wavelengths as short as 4 km are well resolved. Kelvin waves with horizontal wavenumber 1 through 5 dominate the spectrum. Their amplitudes between 20-35-km altitude show clear interannual variation that is locked to the descent of the easterly phase of the quasibiennial oscillation in tropical zonal winds. Below 20 km, Kelvin wave amplitudes show an annual cycle that is related to the annual cycle in upper troposphere winds. From the results of the analysis we also compute wave momentum fluxes, and estimate the strength of the wave-mean flow interaction in the tropical stratosphere.
Alexander Magazinov
Ortland D.
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